Chained Throatseeker could work well in this deck, maybe Contagion Engine as well.
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I'm having trouble seeing th point of having Spirit Cairn in there. There are no cards that make your opponent discard cards. Basically you are betting on them having to much in their hand and having to discard at the end of turn. I would put something else in there, maybe Safe Passage or something. Please let me know if I'm missing something.